Trip Around The World can be an interesting one.
For a newbie .... the bonus of all the same size of squares, using larger sizes, will let it work up fast, so that she can have the feeling of completion and success without a lot of tedious work.
Whether only using three fabrics, or an assortment of RBW fabrics, it can become quite an impressive quilt.
Another one that would work well, Carpenter's Square/Star.
Again, done in big blocks it would work up fast. Here, she would get the experience in making HSTs, for something a little more than just doing blocks together.
Good Luck to you both!